Eclipse is slower than NetBeans or IntelliJ IDEA, yes. Eclipse has not been doing a very good job of keeping up with the times.

As far as Komodo IDE, I agree it performs well as I have used it some. But I also felt like I was back in the stone age compared to IDEA. Komodo's refactoring and intelligent assist features and such are really pretty lacking compared to IDEA or NetBeans. NetBeans and IDEA also both have superior Javascript editing abilities (and given how much app development today involves Web apps and Javascript, I think good Javascript support is absolutely critical in a modern IDE).